Python 指令安装
1 pip3 uninstall xlwt #卸载库 2 pip3 --upgrade xlwt #更新库 3 4 升级：python -m pip install --user --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple 5 安装库：pip install requests -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install ipython -i https://mirrors.aliyun.com/pypi/simple/
pip install ipython -i https://pypi.mirrors.ustc.edu.cn/simple/
pip install ipython -i https://pypi.tuna.tsinghua.edu.cn/simple/
pip install ipython -i https://pypi.mirrors.ustc.edu.cn/simple/
